[78.12] Observing L and T Dwarfs with Keck LGS AO

C. R. Gelino, S. R. Kulkarni (Caltech)

We have been using the Laser Guide Star Adaptive Optics
system on the Keck II telescope to observe L and T dwarfs.
We present here the results of this project, including the
first observations resolving the Kelu-1 binary system. This
system has a separation of about 0.3 arcsec and the
companions differ in K magnitude by 0.39 mag. Multi-epoch
observations indicate the companion is still heading towards
apastron. We will discuss this object as well as our other
targets.